I hope that you will continue to train in Aikido. If you let this bad experience run you out of it, then it will remain a negative, and you will not really have solved anything. If, however, you let it send you to train with someone else, it could turn out to be a very positive experience. It would be a shame to let your anger and frustration deprive you of that opportunity. I think you'd agree that it's at least worth a try... Best of fortune to you...